Panel



FIG. 1 is a front perspective view of a panel showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a side view thereof; and,

FIG. 4 is an enlarged side view thereof taken along line 4-4 of FIG. 3.

The broken lines shown in the figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a panel, as shown and described. 